LTC1324

5

1324fa

TYPICAL PERFORMANCE CHARACTERISTICS

Driver Differential Output Voltage

vs Temperature

Receiver

vs Temperature

TEMPERATURE (C)

–55

65

3.1

3.0

2.9

2.8

2.7

2.6

2.5

2.4

2.3

1324 G12

–35

125

–15

525

45

85 105

TEMPERATURE (C)

–55

65

8

7

6

5

4

3

2

1

0

1324 G13

–35

125

–15

525

45

85 105

PIN FUNCTIONS

NC (Pins 1, 13): No Internal Connection.

SR (Pin 2): Slew Rate Control (TTL Compatible). A high

level on this pin forces the RS485 driver into the low slew

rate mode. A low level forces the driver into the high slew

rate or normal mode. Connected to an internal pull-down.

TXD (Pin 3): RS485 Driver Input (TTL Compatible).

TXDEN (Pin 4): Driver Output Enable (TTL Compatible). A

high level on this pin and a low level on TXDEN (Pin 15)

forces the RS485 driver into three-state. A low level en-

ables the driver.

SHDN (Pin 5): Shutdown Input (TTL Compatible). When

this pin is high, the chip is shut down; the driver and re-

ceiver outputs three-state; and the supply current drops

to 1μA. A low level on this pin allows normal operation.

RXEN (Pin 6): Receiver Enable (TTL Compatible). A high

level on this pin and a low level on RXEN (Pin 14) disables

the receiver and three-states the logic outputs. A low level

allows normal operation.

RXDO (Pin 7): RS485 Receiver Output.

GND (Pin 8): Ground.

RS485 Receiver Noninverting Input. When

RS485 Receiver Inverting Input.

RS485 Driver Noninverting Output.

RS485 Driver Inverting Output.

RXEN (Pin 14): Receiver Enable (TTL Compatible). A low

level on this pin and a high level on RXEN (Pin 6) disables

the receiver and three-states the logic outputs. A high

level allows normal operation. Connected to an internal

pull-down.

TXDEN (Pin 15): Driver Output Enable (TTL Compatible).

A low level on this pin and a high level on TXDEN (Pin 4)

forces the RS485 driver into three-state. A high level

enables the driver. Connected to an internal pull-down.

5.25V. Requires a 1μF bypass capacitor to ground.